[Nook Color General] Blue6IX:
I run this Phiremod image (XDA Forum Link), just burned to the sdcard with winimage. Resize the /sdcard partition and you are set. I've only ever run from sdcard, never flashed the internals of my nook (except upgrading to 1.2).

As to benefit of moving to sd when running from sd, I don't have the technical knowledge to say one way or another beyond:

If you somehow manage to fill your system partition (i've done it) you can't install another app over the limit until you free space. By moving the apps to the /sdcard partition you free /system space, thereby allowing you to install more apps.

Maybe someoone with more technical knowledge can give you more of an answer.

I came by to say that Office Max is having a sale on Sandisk 8 gig MicroSD for 12.99 final price. Applies indiscriminately to class 2 or 4, so the ideal card in it's whole range is on sale there.

I was looking to get 3 more of these over time to use for testing, but with such a great deal I picked them all up at once.

I benched them and here are the results:

Sandisk Class 4 8 Gig (1 of 3)
-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 7.216 MB/s
Sequential Write : 5.841 MB/s
Random Read 512KB : 7.190 MB/s
Random Write 512KB : 1.632 MB/s
Random Read 4KB (QD=1) : 2.211 MB/s [ 539.8 IOPS]
Random Write 4KB (QD=1) : 0.502 MB/s [ 122.7 IOPS]
Random Read 4KB (QD=32) : 2.209 MB/s [ 539.3 IOPS]
Random Write 4KB (QD=32) : 0.524 MB/s [ 128.0 IOPS]

Test : 50 MB [G: 0.0% (0.0/7572.0 MB)] (x5)
Date : 2011/05/31 21:10:59
OS : Windows XP Professional SP3 [5.1 Build 2600] (x86)

Sandisk Class 4 8 Gig (2 of 3)

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 6.422 MB/s
Sequential Write : 4.945 MB/s
Random Read 512KB : 6.244 MB/s
Random Write 512KB : 4.042 MB/s
Random Read 4KB (QD=1) : 0.919 MB/s [ 224.3 IOPS]
Random Write 4KB (QD=1) : 0.595 MB/s [ 145.2 IOPS]
Random Read 4KB (QD=32) : 0.950 MB/s [ 232.0 IOPS]
Random Write 4KB (QD=32) : 0.586 MB/s [ 143.1 IOPS]

Test : 50 MB [G: 0.0% (0.0/7572.0 MB)] (x5)
Date : 2011/05/31 21:20:54
OS : Windows XP Professional SP3 [5.1 Build 2600] (x86)

Sandisk Class 4 8 Gig (3 of 3)

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 6.436 MB/s
Sequential Write : 4.899 MB/s
Random Read 512KB : 6.350 MB/s
Random Write 512KB : 3.922 MB/s
Random Read 4KB (QD=1) : 0.953 MB/s [ 232.7 IOPS]
Random Write 4KB (QD=1) : 0.596 MB/s [ 145.5 IOPS]
Random Read 4KB (QD=32) : 0.986 MB/s [ 240.8 IOPS]
Random Write 4KB (QD=32) : 0.599 MB/s [ 146.2 IOPS]

Test : 50 MB [G: 0.0% (0.0/7572.0 MB)] (x5)
Date : 2011/05/31 21:30:07
OS : Windows XP Professional SP3 [5.1 Build 2600] (x86)

I noticed that all 3 coming off the shelf together benched very similarly. Kinda lends to the theory that it depends on the batch.

Just wanted to pass on the results and news of the sale, maybe someone will have better luck.

All of these cards will run an OS decently from the SD card, especially if coming from a 4kb QD=32 result that starts with 0.0